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angerman/model-parser.clj

Created December 4, 2009 13:56
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model-parser.clj
(defmacro timer
[expr]
`(let [start# (. System (nanoTime))
ret# ~expr]
(/ (double (- (. System (nanoTime)) start#)) 1000000.0)))
(defmacro statistics [n expr]
`(let [timings# (take ~n (repeatedly (fn [] (timer ~expr))))
min# (apply min timings#)
max# (apply max timings#)
mean# (/ (reduce + timings#) ~n)
median# (/ (+ min# max#) 2)
sd# (Math/sqrt (/ (reduce + (map (fn [x#] (Math/pow (- x# mean#) 2)) timings#)) (dec ~n)))]
(printf "Runs: %d
Min: %10.3f
Max: %10.3f
Mean: %10.3f
Median: %10.3f
sd: %10.3f\n"
~n min# max# mean# median# sd#)))
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